<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card class="box-card">
            <!-- 1.准备一个div -->
            <div id="main" style="width:750px;height:400px;"></div>
        </el-card>
    </div>
</template>
<script>

// 2.导入echarts
import * as echarts from "echarts"
// 3.导入lodash
import _ from 'lodash'
export default {
    data() {
        return {
            // 5.需要跟请求的折线图数据合并的option
            options: {
                title: {
                text: '用户来源'
                },
                tooltip: {
                trigger: 'axis',
                axisPointer: {
                    type: 'cross',
                    label: {
                    backgroundColor: '#E9EEF3'
                    }
                }
                },
                grid: {
                left: '3%',
                right: '4%',
                bottom: '3%',
                containLabel: true
                },
                xAxis: [
                {
                    boundaryGap: false
                }
                ],
                yAxis: [
                {
                    type: 'value'
                }
                ]
            },
        }
    },
    created() {

    },
    async mounted() {
        // 在页面dom元素加载完之后执行钩子函数mounted
        // 5.基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))
        // 6.准备数据和配置项
        // 发送请求获得折线图数据
        const {data: res} = await this.$http.get('reports/type/1')
        if (res.meta.status != 200) return this.$message.error(res.meta.msg)
        // 7.合并res.data和this.option
        const result = _.merge(res.data,this.options)
        // 8.使用获取的数据来显示图表
        myChart.setOption(result)
    },
    methods: {

    }
}
</script>